That panel is missing my personal favourite punchline:

I like my women like I like my coffee: covered in bees!

Even outside the joke template, "I like my <plural noun> ..." is a statement purely about preferences, not about actually having multiple <nouns> concurrently. And "my" in English is not purely about ownership, but about relations, ownership being just one specific and quite common relation. (Consider "my school", "my employer", or "my friend").

More to the point, 1337 is the popular convention. If the numbers were not meant as a reference to the convention then they would be more silly than they already are.

Since the word 'rationalist' is used everywhere in the OB sequences and in many LW posts, I don't see why we should have any particular qualms about using 'rationalism'. If it confuses some people, we'll just have to specify what we mean by it, which is something we should be doing anyway.

I was actually just thinking about bringing that up in the open thread. Is there a preferred term for the philosophy characteristic of LW? "Rationalism" does indeed have too many irrelevant associations, from the old-timey Platonic philosophy that we can get useful information about the universe without studying the universe, to the philosophy termed "Traditional Rationality" around here (not sure exactly what defines that, but I have a general sense), to those people who spend a lot of time on reversed stupidity.

If making up a new term is okay (assuming there isn't a preferred term already), I might suggest "neo-rationalism". That way, people will know right away that it has something to do with rationality, but they will have to ask what the "neo-" signifies instead of jumping to any conclusions about it.

Humor will be more relevant post-singularity

That is a significant claim. Not least because it implies that given that a singularity occurs it will be a singularity that doesn't suck. (Better as a goal than it is as a prediction.)